Electric-furnace platform



H. F. PRIWER.

ELECTRIC FURNACE PLATFORM? APPLICATiON FILED JUNE 15, 1920.

1,436,723, -PatentedNov.28,1922.

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H. F. PRIWER.

ELECTRIC FURNACE PLATFORM.

APPLICATION FILED JUNE 15. 1920.

1 #136,723. Patent d N v- 28, 1922.

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UNITED STATES 1,436,723 PATENT OFFICE.

HERMAN F. PRIWER, OF SPRINGFIELD, OHIO, ASSIGNOR F ONE-HALF TO J'bHN E. GALVIN.

ELECTRIC-FURNACE PLATFORM.

Application filed June 15, 1920.

To all whom it wmy concern:

Be it known that I, HERMAN F. PRIWER, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Electric-Furnace Platforms, of which the following is a specification.

This invention relates to electricfurnace platforms and the nature of the invention and its advantages and objects will be best understood from the following:

As ordinarily constructed electric furnaces for the making of steel have a refractory roof or top, usually made up of fire brick arranged in arched form. The electrodes are mounted above the cover and their lower ends project through openings formed in the roof, the electrodes usually being made in sections so that as the electrodes wear, additional sections may be added thereto. Heretoforc it has been necessary for an operator to crawl on the roof to add such sections, and to make adjustments, repairs and the like of the mechanism for operating the electrodes, and serious and fatal accidents are not at all uncommon for the roof sometimes gives way under the weight either because the bricks are improperly secured together or because they have become worn thin, a fact which is not readily discernible for in most furnaces the roof is only removed at intervals for purposes of repair. :11", I propose to overcome the foregoing difiica lties by means of a construction, the preferred embodiments of which I have illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a furnace with my improvements applied thereto; F igure 2 is a plan view of Figure 1 partially broken away; Figure 3 is a fragmentary end elevation of the right hand end of the platform shown in Figures 1 and 2, drawn on an enlarged scale; Figure 4 is an enlarged section taken on the line 4-4 of Figures 2 and 5; and Figure 5 is a section taken on the line 5 5 of Figure 4. 5O Referring now to Figures 1 and 2, the reference letter A represents the electric furnace supported over the pit B formed in the supporting foundation or base C, such base being preferably concrete; the refractory cover is indicated by the reference letter D;

Serial No. 389.075.

and E are the electrodes, the mounting, winches and connections therefor not being shown.

The platform is indicated as a whole by the reference letter F and it comprises the upright post 7 preferably a pipe embedded in the concrete; the platform proper 8 which is swivelled on the top of the post as will further appear; and the ladder 9, The platform is composed of two longitudinally ex tending channels 10, the deck or tread 11 secured to the channels 10 and the rails 13 which are composed of structural members attached to the angles 12, in turn secured to the deck 11. At one end, the platform is provided with a downwardly projecting hub 14 which is provided on each of two opposite hides with a bracket member 15, such members being shaped so as to fit within the channels 10 in the manner indicated in Figure 3. The hub is secured by means of the bolts 16, and the upper end thereof is closed by the cap plate 17. The ends of the hub are rabbeted for the reception of the ball bearing rings 17. The inner ring 18 of the lower bearing is adapted to rest upon a collar 19 which is made fast to the pipe 7, the parts being so arranged that the hub may be dropped down on the pipe from above.

The platform is preferably provided with a latch device for latching it in any one of four positions and to this end I provide the collar 19 with four appropriately spaced notches 20 adapted to be engaged by the pin 21 carried on the arm 22 which is loosely secured to the hub as indicated in Figure 4. The arm is normally held in the position shown in such figure by means of a spring 23. One position of the platform is shown in Figure 2, in which position it will be seen that access is had to two of the electrodes. Another position of the platform is a corro sponding one on the opposite side of the electrodes, while in the remaining two positions the platform lies clear of the furnace to permit of its tilting.

The ladder 9 is secured to the platform and at its lower end is provided with a yoke 24 which embraces the pipe 7 and which is free to rotate with respect thereto.

I claim:

1. The combination with an electric furnace having a refractory roof and electrodes extending downwardly therethrough of a platform swivelled for swinging movement thereover.

2. The combination with a tilting electric furnace having a refractory roof and electrodes extendingdownwardly therethrough of a platform swivelled at one side of the furnace for swinging movement thereover.

3. The combination with an electric furnace having a refractory roof and electrodes extending downwardly therethrough of a platform movably mounted and adapted to be shifted over the furnace roof.

4:. The combination with an electric furnace having a refractory roof and electrodes extending downwardly therethrough of a substantial vertical post mounted to one side of the furnace and substantially in the vertical. plane cutting the of rotation and a platform swivelled on the upper end thereof.

weer/2e 5. The combination with an electric furnace having a refractory roof and electrodes extending downwardly therethrough of a substantial vertical post mounted to one side of the furnace and a platform swivelled on the upper end thereof, together with means for releasably fixing the platform against rotation about said post.

6. The combination with an electric furnace having a refractory roof and electrodes extending downwardly therethrough of a platform movably mounted and adapted to be shifted over the furnace, a substantially vertical post at one side of the furnace, a platform provided with a hub adapted to lit the post, and a collar on the post against which the hub bears.

In testimony whereof, I have signed my name.

' HERMAN F. PR-TW ER.

hereunto 

